Piston skirt drilling jig



Oct. 22, 1940. H. P. PHILLIPS PISTON SKIRT DRILLING JIG Filed Oct. 23, 1959 INVENTOR.

BY #UPU/0 1.0 PMN/)U6 ATTORNEYS I`155 previouslyiformedlopening.

yPatented Oct. 22, 1940 1j fors-lice y 2.218368 imsironlsmnr DRILLING and .-Hawld Pl VrPhilliiis;elsticas, Mdr assignorftu,

`Hastings Manufacturing' (Hn'npany, Hastings,

invention relates lto =-improvements 1in rpistornskirtfdrilllingjigs. f' The maimobjectsfovmyinvention are: v l y i First, '-to'fprovide Janovelrg'ig fzferzlocati-ng-:and "5 `'lziositioninga:dri-lling tool ltoi-holespinza fpistonfskint Y-ad'a-pted'to receivealpistonrskrtlexpander.

'.V,...Second,1to lprovide a 'device fof the ty-pe de-- l.smfibed. 'which is fextremeliylsi'mplerand'inexpensive v rin lits.zpartsandcapablegof `:ready and :quick-posi- '10 ti'oningmnafpistonskirt.

which iny operative. erected, posi-tionlaccuratelyilos cates a drill for forming an opening in aatubular cylindrical smem-b'er dainetrically opposite a 1 fleuri-,h5 `to provide :a jig `of *the type .described -for positioning a :drilling .tool :to Pform fa-:hole at 18.0 degrees Jfrom .la :previously .formed .'holein la cylindricaktubular par-mithesaid jigbeingloffsuch aquent-actualldrilling '.ofithemember.

which ,iis .compact :andren-:contained -:nature .with no likelihood kof f inadvertentflossiof spart-s.

which@willyaccommdatemistons oiallarge range *gf SZeS. i

y ,Further objects relating :to4 ydetails @and .lecon- :ornieslof .my invention willzdenitelyappear from ,theqdescriptionftoifollow. .Theinventionfis de- .TA :structure I:embodying itheifeatures sof .myiin- .vention-,is illustrated inthe accompanying drawing, wherein:

:535 l, Eig. .-1 .is-aplan -viewcof 1.a gpistlon iwiththejig of :my .invention :operatiyely secured vthei.etc the .piston 4being partiallyibroken away andinsection toiillustrate lthecoacting relationgofathegjigtherewith.

,lo flig. 2.is afragmentaryzviewpinsectionn line 5 vfurther .illustrating the construction andaoperaf.

tiem of the device.

i.-Eig. vl is.` a .fragmentary ,viewin VAsection on line The present invention relates fto :a iig for en.

#5o .abling .an .opening or hole ,tofbe drilledn ;a1-piston .-skrt.180degrees -or Qdiametrically ,opposite :a previously formed Y opening. IThese openings are .utilized ;for .mounting va'piston expander -fof :the

.type L4illustrated and described in smy appending M `application Serial No. 237;686, ledQc'tober 219.,A

''Mich.,a corporation of Michigan l I npplieaunmomberlza, 1939, seriarNo. 300,751L

` ironing. f (omi-,62)

F1938, andeit -is of substantial Yimportancer tha-tithe =holes receiving vvthefsamelflfie disposed at -eXactly l -lgoclegreesfrom oneanother. Brieflystated, the present jig is of sucheconstruction-asto-enable'its -ready and `accuratepositioning on -a lpiston skirt 5 'to-accomplishthis purpose, and, moreover, it is' #simple and inexpensive in its parts `and does -not `interferey with the -drilling-=operation after it has 'beenpositicned v `Inthe `drawing the reference numeral Irindi- Cates an Yinternalcombustion engine piston vin the' :skirt 2770i whichit is desiredtofprovi'deapalr-of diametrically opposed -sholes'in spaced -relatonrto the skirt edge and at^l90y degrees E'from the wrist fpfn bosses 3.r l

XThe Ejig'in a preferred constructionconsists'fo 'an-angled body Amember-"4 having `a la'w member su'ltfthatiwhenzthe .screw is turned in ,clockwise ldirection lthe :jaw Vmembers 5, i9 are urged into A,clamping lrelation tofthepistonskirtitofsecurezthe yf iigLonthelatter.. y

The arms I extend forwardly ,tof-a g-pointgfap- 35 .zproximately centrally of .the skirt ,and are :pro.

lvided .at Athis pointiwitha pin 'I 2;.eXtending-therebetween, which pin guidnglyreceives a locating finger 1.I.3. f ,Finger .Ji-3 V,is in :thefform A of 1.a sheet Ametal :stamping ,of ...U -shaped vfsection, .although it 40 y,will be Iapparent'.that it might be "formed :from va. rsolid piece, and has an .elongated slot M extend- Jing parallel therewith-'to receive fthe-pin .I2 and permit lOngitudinaISand `pivotal Amovement-,of the n'ger I3 rwith reference to the arms "1 and the -fbody-member Il.v Care shouldbe taken that there 'isnolateralplay of thef'nger inthe form, asthis would Ydetract from (the accuracy. Vof the 'jig. Finger I3 is obviously movable and .swingable in I50 a plane which includesthe axis o'f the skirt when `lhell'ig is .properly positioned .andclamped i. e.

Lit y.is in: diametrcal'falinement :withsaid axis and with -the;c1a-mpng pointof `-n1. -.ml:ers 5, 9. `The nger I3 .'terminatesna ,point I5Y engageable in :55

axially with reference to the skirt extremity. With the jig so positioned the hole I6 is formed in"- the skirt by the drill I'I guided by the guide hole I8 in the depending jaw member 5. The jig is then removed and loosely placed -on the opposite side of the skirt with the pointer I extendeddiA`V ametrically and inserted in the just formed hole IB in the manner illustrated in Figs. 2 and.3.r

This positions the jaw members 5, 9 accurately on the skirt at a point diametrically opposite the hole and, taking care that the, jig rests firmly. on the skirt extremity, the screw I I `is again actuated to clamp the jig in place, after which the second hole is drilled in an obvious manner.

Once the jig has been set for drilling of the second hole the Vlinger ,I`3 n 1ay be withdrawn rear,- lwardly, thus clearing the exterior surface of the skirt of any objects which would interfere with its being laid at on the table of a drill press. Accordingly, the drilling of the second hole is not interfered with by reason of the piston being at an anglepto the supporting table, as is the result `ingmany vcases in which the jigemploys vclamps over both sides of the skirt.

It will be observed that the mounting for the positioning or locating nger I3 within the sloi'l of the jaw member is in eiect a floating mounting-that is, it may be freely adjusted within the slot, the walls of the slot however holding it against lateral movement. This also enables the -jig to be used in the drilling of work of considerable range of diameters.

The above described jig is simple in its construction and self-contained so that there is no possibility of loss of parts. It is extremely accurate in its operation and is quicklyand easily put in place on the piston operated on by an unskilled worker. v.

I have illustrated and described my improvements in an embodiment which is very practical. I have not attempted4 to illustrate or describe other embodiments or adaptations as it is believed this disclosure will enable those skilled in the art to embody or adapt my improvements as may be desired.

Having thus described my invention, what I claim as newand desire to secure by Letters Patent, is:

1. A jig for drilling diametrically opposed holes in. piston skirtsor similar cylindricall objects, comprising a body member adapted to be positioned on the skirt in abutting engagement with the eX- tremity thereof and extending interiorly adjacent the side thereof, a clamping member pivotally mounted on said body member and engageable with the.. skirt interiorly; thereof,y wlampthe *pointer being in *alinement with v said 'j aw mem- `Vber' whereby 'to extend diametrically with 4r'eference thereto when the jig is clamped on the skirt and having an extremity engageable in a previously formed holevin the skirt to locate the jig for clamping with reference to said hole, said body member having a guide hole therein in diametrical alinement with said pointer and jaw for reception of a drilling tool, said pointer being diametrically retractable from said hole when the jig has beenproperly clamped with reference to the latter.

2. A jig for drilling diametrically opposed holes "fin piston skirts or similar cylindrical objects vcomprising a body member adapted to be positioned on the skirt and having a portion extending exteriorly adjacent the side thereof, a clampberand" body member to actuate the same to eiect clamping engagement ofthe jigjwith the skirt, and a locating pointer pivotedV on said body member `forangular movement relative thereto in a planer, including then axis of lthe skirt, said pointer being in alinement `with said jaw member whereby to extend diametrically with reference thereto when the jig is clampedon the skirt and being engageable in a previously formed hole in the skirt to locate thejg for Aclamping with reference to said hole, said body member having a guide hole therein in diametrical alinement with said pointer and jaw for reception of a drillingtool. "I

3. A jig for drilling a hole-ina cylindrical structure in predetermined relation to a previously formed hole therein, comprising a base member engageable with said structure and having a jaw extending substantially parallel to said structure exteriorlyethereof, 'a' jawf carrying" memnberpivoted onsaidi body. member and extending interiorly ofxfsaid'structure;I means lthreaded in .one of said members and engageable with the other to actuate the jawsl intofclamping relation to the structure, a pointer pivotally and retractably mounted on. said vbase member, said lbase member vhaving a jigopening, said'pointerhaving a terminal portion engageable in a previously formed holein the `structure to thereby position said jaws whereby when the latter are clamped on 'the structure vsaid jig opening is disposed-in predetermined relation to said vpreviously' formed opening, said-pointer being retractable from rsaid previously drilledhole'whilel'said jaws are in operative clamping position.

in pistonl vskirts or'similar `cylindrical objects, comprising a body memb'eriadapted to bepositioned on the skirt and extending exteriorly adjacent the side thereof, a clamping member as- .sociated with said body member and engageable with the skirtinteriorly thereof -to-clamp the same between-said members, means to actuate said members toeilect clamping engagementof the jig with the skirt, and a locating pointer adfor receptionfof-a drilling tool. r

4. LA jig forl drilling diametrically opposed holes i' .justable on said body member for movement relai 5. A'jig forv drilling diametrically opposed holes in tubular parts comprising a longitudinally slotted jaw'member having a fixed jaw, .said iixed `jaw having a pilot' opening therein,A a movable jaw pivotally mounted in said slot,a clamping screw arranged through said movable jaw to engage said fixed jaw member, anda'loc'ating finger pivotally and sl-idably mounted in said' slot and having a tapered tip engageablevwith a previously formed boletin the work.

6. A jig for drilling diametrically opposed holes in tubularparts comprising a longitudinally rslotted jaw member having a `iixed jaw,'said fixed Jaw, having a pilot opening therein, a movable jaw' pivotally mounted in said slot, a screw adjusting means for said movable jaw, and a lo-` l eating finger slidably adjustable in said slot for engagement with a positioning part of the Work. f

'7. In a-devce of the class described, the combination Withajaw member provided with an external xed jaw having a pilot opening therein,

a coacting adjustably mounted internal jaw,

screw means for adjusting said internal jaw, and a locating finger pivotally and slidably adjustable on said jaw member and adapted for positioning engagement with a. hole in the work.

8. In a device of the class described, the com# bination with a'jaw. member provided with an external xed jaw having a pilot opening therein,

a coacting adjustable internal jaw, means -for adr justing said internal jaw,l and a locating finger oatingly mounted on said jaw member and adapted for positioning engagement witha hole.

in the Work. l

, 9.v `A jig for drilling diametrical holes in tubular parts ycomprising la longitudinally slotted jaw `member having anl external xed jaw, said xed jaw having -apilot opening therein, lan adjustable internal jaw `pivotally mounted in said slot, a

vclamping screw arranged through said movable jawA to engage said fixed jaw, and a locatingnger floatingly mounted in said vslot and having ra tapered tip engageable with a previously formed A hole in the. Work.

10'. In a device of the class described, the com. bination'with a jaw member provided with la fixed external jaw having a'pilot openingtherein, of

a coacting adjustableinternal jaw, and a locating jaw member having an external xed jaw having a pilot opening therein, a coacting adjustable jaw, and a locating nger voatingly mounted in said slot and engageable with a locating part of the work. 1 f

' HAROLD P. PHILLIPS. 

